What is MARPAT?
MARPAT is a complex and rich database of chemical Markush structures from patents. Structure searching in MARPAT allows retrieval of patent records that might be missed by relying solely on other types of patent searching. The more experience you can gain in the use of this database, the more you will benefit from its valuable content. LMARPAT is a Markush learning database that you can use to practice search techniques.
WHAT ARE MARKUSH STRUCTURES?
Patent documents often contain many specific chemical substances as well as generic structures. Generic structures are named "Markush" because of a dye chemist, Eugene Markush, who was the first person to successfully obtain a patent based on generic structures in 1923. A Markush structure is a single structure used to define a set of implied structures specified on the "atom" level (methyl, phenyl) and/or "generic" level (alkyl, aryl). It occurs in the claims and/or the disclosure portion of patent documents. This allows the patent applicant to reasonably broaden or extend the scope of their invention without specifying every single substance to be covered by the patent. MARPAT on STN offers valuable access points to the patent literature for chemical substances by making these structures searchable.
VALUE OF MARPAT
MARPAT is a database of Markush structures built through intellectual analysis of the entire patent document by highly trained experts. The MARPAT structures mirror the Markush structures and the language found in the patent record itself. The specific claims, examples, and special definitions of terminology are covered to contain complete Markush structures representing many possible substances. Searching MARPAT for the many substances represented by Markush structures is an invaluable companion to patent searches for specific substances in REGISTRY and CAplus or other patent databases. A patent substance search without MARPAT cannot be considered comprehensive and complete.